You know, I've seen the same thing, and been frustrated by it. But, out of the blue, I read something yesterday --- do you think I can remember where?! --- that said washed fabrics fray less than unwashed fabrics. Hmmm.
I have many fabrics from my first years of collecting that were all washed, until I finally gave up that exhaustive effort. And most of them are not fraying! Wow, who'd have thought? I may bite the bullet and wash all my solids before I move to where i can't have a washer/dryer in my apartment!
Jan in VA